Cancellation of Crosstalk Energy in Communication Loops

1. A method further comprising: applying a signal to a first communication medium; measuring a first crosstalk associated with a second communication medium based on the applied signal; determining a coupling relationship associated with the first communication medium and the second communication medium based on the measured first crosstalk; determining a second crosstalk associated with the second communication medium based on the determined coupling relationship wherein determining the second crosstalk includes estimating the second crosstalk based on the determined coupling relationship without directly measuring the second crosstalk at an end associated with the second communication medium; and determining a compensation signal to compensate for the second crosstalk associated with the second communication medium based on the determined second crosstalk; estimating the first crosstalk at the end associated with the second communication medium based on the determined coupling relationship; comparing the measured first crosstalk with the estimated first crosstalk; and determining a new coupling relationship if the comparison shows a crosstalk difference that exceeds a predetermined threshold, wherein determining the second crosstalk based on the determined coupling relationship includes determining the second crosstalk using the determined new coupling relationship as the determined coupling relationship.

2. The method of claim 1 , wherein determining the new coupling relationship includes: applying a new signal to the first communication medium; re-measuring the first crosstalk associated with the second communication medium based on the applied new signal; and determining the new coupling relationship based on the re-measured first crosstalk.

3. A method comprising: applying a signal to a first communication medium; measuring a first crosstalk associated with a second communication medium based on the applied signal; determining a coupling relationship associated with the first communication medium and the second communication medium based on the measured first crosstalk; determining a second crosstalk associated with the second communication medium based on the determined coupling relationship; and determining a compensation signal to compensate for the second crosstalk associated with the second communication medium based on the determined second crosstalk; applying the compensation signal to the second communication medium; measuring the first crosstalk after applying the compensation signal to detect one or more changes associated with the determined coupling relationship; and determining a new compensation signal to compensate for the one or more detected changes.

4. A system comprising: one or more first transmitters to transmit one or more signals on a first communication medium; one or more second transmitters to transmit one or more signals on a second communication medium; and a crosstalk canceller configured to: determine a first crosstalk associated with the first communication medium, the first crosstalk resulting from the one or more signals transmitted on the second communication medium by the one or more second transmitters; and determine a second crosstalk associated with the first communication medium based on the determined first crosstalk including estimating the second crosstalk based on the determined coupling relationship to determine the second crosstalk without directly measuring the second crosstalk at an end associated with the second communication medium; estimate the first crosstalk at the end associated with the second communication medium based on the determined coupling relationship; compare the measured first crosstalk with the estimated first crosstalk; and determine a new coupling relationship if the comparison shows a crosstalk difference that exceeds a predetermined threshold, wherein the second crosstalk is determined using the determined new coupling relationship as the determined coupling relationship.

5. The system of claim 4 , wherein the crosstalk canceller is further configured to: apply a new signal to the first communication medium; re-measure the first crosstalk associated with the second communication medium based on the applied new signal; and determine the new coupling relationship based on the re-measured first crosstalk.

6. A system comprising: one or more first transmitters to transmit one or more signals on a first communication medium; one or more second transmitters to transmit one or more signals on a second communication medium; and a crosstalk canceller configured to: apply a signal to a first communication medium; measure a first crosstalk associated with a second communication medium based on the applied signal; determine a coupling relationship associated with the first communication medium and the second communication medium based on the measured first crosstalk; determine a second crosstalk associated with the second communication medium based on the determined coupling relationship; and determine a compensation signal to compensate for the second crosstalk associated with the second communication medium based on the determined second crosstalk; apply the compensation signal to the second communication medium; measure the first crosstalk after applying the compensation signal to detect one or more changes associated with the determined coupling relationship; and determine a new compensation signal to compensate for the one or more detected changes.